For example, to plot X*X in HP 9830 BASIC, the program would be 10 SCALE -1,1,1,1 20 FOR X = -1 to 1 STEP 0.1 30 PLOT X, X*X 40 NEXT X 50 PEN 60 END Early pen plotters, e.g., the Calcomp 565 of 1959, worked by placing the paper over a roller that moved the paper back and forth for X motion, while the pen moved back and forth on a track for Y motion.
A later change was the addition of an electrically controlled clamp to hold the pens, which allowed them to be changed, and thus create multi-colored output. Hewlett Packard and Tektronix produced small, desktop-sized flatbed plotters in the late 1960s and 1970s.
A later change was the addition of an electrically controlled clamp to hold the pens, which allowed them to be changed, and thus create multi-colored output. Hewlett Packard and Tektronix produced small, desktop-sized flatbed plotters in the late 1960s and 1970s.
Printers with graphics capabilities took away some of the market by the early 1980s, and the introduction of laser printers in the mid-1980s largely eliminated the use of plotters from most roles. Plotters retained a niche for producing very large drawings for many years, but have now largely been replaced by wide-format conventional printers.
Due to the mass of the bar, these plotters operated relatively slowly. In the 1980s, the small and lightweight HP 7470 introduced the "grit wheel" mechanism, eliminating the need for perforations along the edges, unlike the Calcomp plotters two decades earlier.
The coversheet is also cut, which may lead to a slight loss of vacuum around the edges of the coversheet, but this loss is not significant. ==Contemporary uses of pen plotters== In the mid-to-late 2000s artists and hackers began to rediscover pen plotters as quirky, customizable output devices.
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